Issue #26331: Implement the parsing part of PEP 515.

Thanks to Georg Brandl for the patch.

1 files changed, 10 insertions, 0 deletions

diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
index 7492f5466f..617a37eec8 100644
--- a/Lib/test/test_decimal.py
+++ b/Lib/test/test_decimal.py
@@ -554,6 +554,10 @@ class ExplicitConstructionTest(unittest.TestCase):
         self.assertEqual(str(Decimal('  -7.89')), '-7.89')
         self.assertEqual(str(Decimal("  3.45679  ")), '3.45679')
 
+        # underscores
+        self.assertEqual(str(Decimal('1_3.3e4_0')), '1.33E+41')
+        self.assertEqual(str(Decimal('1_0_0_0')), '1000')
+
         # unicode whitespace
         for lead in ["", ' ', '\u00a0', '\u205f']:
             for trail in ["", ' ', '\u00a0', '\u205f']:
@@ -578,6 +582,9 @@ class ExplicitConstructionTest(unittest.TestCase):
             # embedded NUL
             self.assertRaises(InvalidOperation, Decimal, "12\u00003")
 
+            # underscores don't prevent errors
+            self.assertRaises(InvalidOperation, Decimal, "1_2_\u00003")
+
     @cpython_only
     def test_from_legacy_strings(self):
         import _testcapi
@@ -772,6 +779,9 @@ class ExplicitConstructionTest(unittest.TestCase):
         self.assertRaises(InvalidOperation, nc.create_decimal, "xyz")
         self.assertRaises(ValueError, nc.create_decimal, (1, "xyz", -25))
         self.assertRaises(TypeError, nc.create_decimal, "1234", "5678")
+        # no whitespace and underscore stripping is done with this method
+        self.assertRaises(InvalidOperation, nc.create_decimal, " 1234")
+        self.assertRaises(InvalidOperation, nc.create_decimal, "12_34")
 
         # too many NaN payload digits
         nc.prec = 3